package com.hdmall.business.common.util;

import sun.misc.BASE64Encoder;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class ImageUtil {
    /**
     * 图片上传
     * @param imageUrl
     * @return
     * @throws Exception
     */
    public static String getURLImage(String imageUrl) throws Exception {  
        //new一个URL对象  
        URL url = new URL(imageUrl);
        //打开链接
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置请求方式为"GET"  
        conn.setRequestMethod("GET");  
        //超时响应时间为5秒  
        conn.setConnectTimeout(5 * 1000);  
        //通过输入流获取图片数据  
        InputStream inStream = conn.getInputStream();
        //得到图片的二进制数据，以二进制封装得到数据，具有通用性  
        byte[] data = readInputStream(inStream);  
        BASE64Encoder encode = new BASE64Encoder();
        String s = encode.encode(data);  
        return s;  
    }  
  
    private static byte[] readInputStream(InputStream inStream) throws Exception{  
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串  
        byte[] buffer = new byte[1024];  
        //每次读取的字符串长度，如果为-1，代表全部读取完毕  
        int len = 0;  
        //使用一个输入流从buffer里把数据读取出来  
        while( (len=inStream.read(buffer)) != -1 ){  
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度  
            outStream.write(buffer, 0, len);  
        }  
        //关闭输入流  
        inStream.close();  
        //把outStream里的数据写入内存  
        return outStream.toByteArray();  
    }

}  